The world needs a new source of energy, an unspillable source.

Can I change to Biofuel?

I want to buy a Dodge Intrepid, which is a V6 (6 cylinders) engine. Is there any way I can convert this to run on bio fuels? (Biodeisel, waste oils, whatever…)
EDIT:
I suppose I should have said that I would not mind changing the engine. Buying a new one, you know? It’s just that I was wondering if I could buy one that could work, not change what I’ve already got.